<template>
  <div class="xtx-carousel">
    <ul class="carousel-body">
      <li
        class="carousel-item"
        v-for="(item, index) in sliders"
        :key="item.id"
        :class="{ fade: activeIndex === index }"
      >
        <RouterLink to="item.hrefUrl">
          <img :src="item.imgUrl" alt="" />
        </RouterLink>
      </li>
    </ul>
    <a href="javascript:;" class="carousel-btn prev" @click="changeIndex(-1)">
      <i class="iconfont icon-angle-left"></i>
    </a>
    <a href="javascript:;" class="carousel-btn next" @click="changeIndex(1)">
      <i class="iconfont icon-angle-right"></i>
    </a>
    <div class="carousel-indicator">
      <span
        v-for="(item, index) in sliders"
        :key="item.id"
        :class="{ active: activeIndex === index }"
        @click="activeIndex = index"
      ></span>
    </div>
  </div>
</template>

<script>
import { ref } from 'vue'

export default {
  name: 'XtxCarousel',
  props: {
    sliders: {
      type: Array,
      default: () => {}
    },
    duration: {
      type: Number,
      default: 3000
    },
    autoPlay: {
      type: Boolean,
      default: false
    }
  },
  setup (props) {
    const activeIndex = ref(0)
    // console.log(props.sliders)

    // 自动播放
    // let timerId = null
    // const autoPlayFn = () => {
    // // 清除旧的定时器
    //   clearInterval(timerId)

    //   // 启动定时器
    //   timerId = setInterval(() => {
    //     changeIndex(1)
    //   }, props.duration)
    // }

    // watch(() => props.sliders, (val) => {
    //   if (val.length > 1 && props.autoPlay) {
    //     autoPlayFn()
    //   }
    // }, { immediate: true })

    const changeIndex = (number) => {
      const temp = activeIndex.value + number
      //   最大页数：
      if (temp > props.sliders.length - 1) {
        activeIndex.value = 0
        return
      }
      // 最小页数：
      if (temp < 0) {
        activeIndex.value = props.sliders.length - 1
        return
      }

      activeIndex.value = temp
    }

    return { changeIndex, activeIndex }
  }
}
</script>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>
